Jack in the Box
And Sonic Decline

NEW YORK -- Small-capitalization stocks underperformed the major indexes on Wednesday after a case of suspected mad-cow disease sparked a selloff in restaurant stocks.

Shares of fast-food chains and steak houses fell after federal officials said they found a suspected case of mad-cow disease in Washington state. Ryan's Family Steak Houses dropped 93 cents, or 5.8%, to $14.99, and Sonic fell 1.53, or 4.9%, to 29.51. Jack in the Box...